A modern, fast(eventually), and secure JavaScript & TypeScript runtime built from the ground up in Rust 🦀 and powered by Nova Engine and Oxc.

Andromeda provides zero-config TypeScript support, rich Web APIs, and native performance - making it perfect for scripts, utilities, and applications that need to run fast without the complexity of traditional Node.js setups.

Join our Discord community to discuss ideas and get involved!

Key Features

• Zero-configuration TypeScript - Run .ts files directly, no transpilation needed
• Import Maps - Modern module resolution with bare specifiers and CDN integration Built-in HTTP Server - Create web servers and APIs with minimal configuration
• GPU-Accelerated Canvas - Hardware-accelerated 2D Canvas API with WGPU backend and PNG export
• Web Crypto API - Industry-standard cryptographic primitives
• SQLite Support - Built-in support for SQLite databases
• File System Access - Simple APIs for reading/writing files
• Web Storage - localStorage and sessionStorage APIs for data persistence
• Native Performance - Rust-powered execution with Nova's optimized JS engine
• Developer Tools - Interactive REPL, code formatter, single-file compilation, and performance profiling with hotpath
• Performance Profiling - Integrated hotpath profiler for identifying bottlenecks and optimizing runtime performance for andromeda development
• Web Standards - TextEncoder/Decoder, Performance API, and more
• Extensible - Modular architecture with optional features
• Self-Updating - Built-in upgrade system to stay current with latest releases
• Shell Integration - Auto-completion support for bash, zsh, fish, and PowerShell

Standards & Compatibility

Andromeda aims to be WinterTC compliant, ensuring interoperability and compatibility with the broader JavaScript ecosystem. WinterTC provides a test suite for JavaScript engines to ensure they conform to ECMAScript standards and common runtime behaviors.

Note: ⚠️ Andromeda is in active development. While functional, it's not yet recommended for production use.

Quick Start

Installation

Platform specific instructions:

Linux/Mac:

curl -fsSL https://tryandromeda.dev/install.sh | bash

Windows (PowerShell):

irm -Uri "https://tryandromeda.dev/install.ps1" | Invoke-Expression

Windows (CMD):

curl -L -o install.bat https://tryandromeda.dev/install.bat && install.bat

Install Andromeda using Cargo:

cargo install --git https://github.com/tryandromeda/andromeda andromeda

Install Andromeda using winget:

winget install --id Andromeda.Andromeda

Running Code

Execute JavaScript or TypeScript files directly:

# Run a TypeScript file (no compilation needed!)
andromeda run hello.ts
# Run multiple files
andromeda run script1.js script2.ts
# Run with verbose output
andromeda run --verbose my-script.ts

Example: Hello World with Canvas

// Create a simple drawing
const canvas = new OffscreenCanvas(400, 300);
const ctx = canvas.getContext("2d")!;
ctx.fillStyle = "#ff6b6b";
ctx.fillRect(50, 50, 100, 100);
ctx.fillStyle = "#4ecdc4";
ctx.beginPath();
ctx.arc(200, 150, 50, 0, Math.PI * 2);
ctx.fill();
// Save as PNG
canvas.saveAsPng("output.png");
console.log("Image saved to output.png");

Example: Standard Library

import { Queue } from "https://tryandromeda.dev/std/collections/mod.ts";
import { flatten } from "https://tryandromeda.dev/std/data/mod.ts";
const queue = new Queue();
queue.enqueue("first");
queue.enqueue("second");
console.log(queue.dequeue());
console.log(queue.size);
console.log(flatten([[1, 2], [3, [4, 5]]], 1));
console.log(flatten([[1, 2], [3, [4, 5]]], 2));

Core APIs

File System

// Read and write files synchronously
const content = Andromeda.readTextFileSync("input.txt");
Andromeda.writeTextFileSync("output.txt", content.toUpperCase());
// and asynchronously
const contentAsync = await Andromeda.readTextFile("input.txt");
await Andromeda.writeTextFile("output.txt", contentAsync.toUpperCase());
// Access environment variables
const home = Andromeda.env.get("HOME");
Andromeda.env.set("MY_VAR", "value");

Canvas & Graphics

// Create graphics programmatically
const canvas = new OffscreenCanvas(800, 600);
const ctx = canvas.getContext("2d")!;
// Draw with full Canvas 2D API
ctx.fillStyle = "linear-gradient(45deg, #f093fb, #f5576c)";
ctx.fillRect(0, 0, 800, 600);
// Export to PNG
canvas.saveAsPng("artwork.png");

Web Storage

// localStorage and sessionStorage APIs
localStorage.setItem("user-preference", "dark-mode");
const preference = localStorage.getItem("user-preference");
console.log("Stored items:", localStorage.length);
// Session storage for temporary data
sessionStorage.setItem("session-id", crypto.randomUUID());
const sessionId = sessionStorage.getItem("session-id");

Cryptography

// Generate secure random values
const uuid = crypto.randomUUID();
const randomBytes = crypto.getRandomValues(new Uint8Array(32));
// Hash data
const data = new TextEncoder().encode("Hello, World!");
const hash = await crypto.subtle.digest("SHA-256", data);

Performance Monitoring

// High-precision timing
const start = performance.now();
await someAsyncOperation();
const duration = performance.now() - start;
// Performance marks and measures
performance.mark("operation-start");
await doWork();
performance.mark("operation-end");
performance.measure("total-time", "operation-start", "operation-end");

Web Workers

Run JavaScript or TypeScript on a separate OS thread. Andromeda implements the WHATWG dedicated Worker API with module workers, structured-clone messaging, and MessageChannel/MessagePort.

// worker.ts
self.onmessage = (event) => {
  self.postMessage({ doubled: (event.data as number) * 2 });
};

// main.ts
const worker = new Worker(
  new URL("./worker.ts", import.meta.url),
  { type: "module" },
);
worker.onmessage = (event) => {
  console.log(event.data); // { doubled: 84 }
  worker.terminate();
};
worker.postMessage(42);

In-realm message passing with MessageChannel:

const channel = new MessageChannel();
channel.port1.onmessage = (e) => console.log("port1 got:", e.data);
channel.port2.postMessage("hello");

Database Operations

const db = new Database(":memory:");
const stmt = db.prepare("INSERT INTO users (name, email) VALUES (?, ?)");
stmt.run("Alice", "alice@example.com");
const users = db.prepare("SELECT * FROM users").all();
console.log(users);
db.close();

Developer Experience

Interactive REPL

Andromeda includes a powerful REPL with enhanced developer experience:

# Start the interactive REPL
andromeda repl

REPL Features:

• Advanced Syntax Highlighting - TypeScript-aware coloring with keyword recognition
• Smart Multiline Input - Automatic detection of incomplete syntax (functions, objects, etc.)
• Performance Metrics - Execution timing for every evaluation
• Command History - Navigate through previous commands with arrow keys
• Built-in Commands - help, history, clear, gc, exit
• Auto-completion - Context-aware suggestions for JavaScript/TypeScript

Code Formatting

Format TypeScript and JavaScript files with the built-in formatter:

# Format specific files
andromeda fmt script.ts utils.js
# Format entire directories
andromeda fmt src/ examples/
# Format current directory
andromeda fmt

Single-File Compilation

Compile your scripts into standalone executables:

# Create a single-file executable
andromeda compile my-script.ts my-app.exe
# Run the compiled executable directly
./my-app.exe

Language Server Protocol (LSP)

Andromeda includes a built-in Language Server that provides real-time diagnostics and linting capabilities for JavaScript and TypeScript files in your editor:

# Start the Language Server (typically called by your editor)
andromeda lsp

LSP Features:

• Real-time Diagnostics - Live error reporting as you type
• Comprehensive Linting - 5 built-in rules for code quality:
  • Empty function detection
  • Empty statement detection
  • Variable usage validation
  • Unreachable code detection
  • Invalid syntax highlighting
• Multi-file Support - Workspace-wide analysis
• Rich Error Messages - Detailed explanations with code context
• Editor Integration - Works with VS Code, Neovim, and other LSP-compatible editors

Configure your editor to use andromeda lsp as the language server for JavaScript and TypeScript files to get instant feedback on code quality.

Shell Integration

Generate completion scripts for your shell:

# Auto-detect shell and generate completions
andromeda completions
# Generate for specific shells
andromeda completions bash > /etc/bash_completion.d/andromeda
andromeda completions zsh > ~/.zsh/completions/_andromeda
andromeda completions fish > ~/.config/fish/completions/andromeda.fish
andromeda completions powershell > $PROFILE/andromeda.ps1

Self-Updating

Keep Andromeda up to date with the built-in upgrade system:

# Upgrade to latest version
andromeda upgrade
# Force reinstall current version
andromeda upgrade --force
# Upgrade to specific version
andromeda upgrade --version 0.1.0-draft-49
# Preview what would be upgraded
andromeda upgrade --dry-run

Task System

Andromeda includes a powerful task system inspired by Deno, allowing you to define and run custom scripts and workflows directly from your configuration file.

Defining Tasks

Tasks are defined in your andromeda.json, andromeda.toml, or andromeda.yaml configuration file:

{
  "tasks": {
    "dev": "andromeda run src/main.ts",
    "build": "echo Building project...",
    "test": "andromeda run tests/main.ts",
  }
}

Running Tasks

# List all available tasks
andromeda task
# Run a specific task
andromeda task dev
andromeda task build
andromeda task test

Architecture & Extensions

Andromeda is built with a modular architecture, allowing features to be enabled or disabled as needed:

Runtime Extensions

Window extension (optional, behind window feature)

The window feature adds Andromeda.Window — a native OS window backed by winit on macOS, Windows, and Linux (X11/Wayland). Inspired by deno-windowing/dwm, the class extends EventTarget and dispatches DOM-style events (resize, close, keydown, keyup, mousemove, mousedown, mouseup).

const win = Andromeda.createWindow({ title: "Hello", width: 640, height: 480 });
win.addEventListener("keydown", (e) => {
  if ((e as CustomEvent).detail.code === "Escape") win.close();
});
await Andromeda.Window.mainloop();

Enable the feature:

cargo run --features window -- run examples/window.ts

window.rawHandle() returns a { system, windowHandle, displayHandle, width, height } object compatible with Deno.UnsafeWindowSurface for future WebGPU-surface bridges.

When the canvas feature is also enabled, window.presentCanvas(canvas) blits an OffscreenCanvas's latest frame into the window via a shared wgpu device — no CPU readback, any size allowed. examples/window.ts demonstrates a live 2D scene streamed from an OffscreenCanvas into a winit-backed window. examples/breakout.ts is a keyboard-driven Breakout clone exercising the full window + canvas input/render pipeline.

Andromeda Satellites

Satellites are minimal, purpose-built executables designed for containerized environments and microservice architectures. Each satellite focuses on a single capability, providing smaller container images, faster startup times, and better resource utilization.

Available Satellites

• andromeda-run - Execute JavaScript/TypeScript in production containers
• andromeda-compile - Compile JS/TS to executables
• andromeda-fmt - Format code
• andromeda-lint - Lint code for quality issues
• andromeda-bundle - Bundle and minify code

Crates

Contributing

Andromeda is an open-source project and welcomes contributions! Whether you're interested in:

• Bug fixes - Help improve stability
• New features - Add runtime capabilities
• Documentation - Improve guides and examples
• Testing - Expand test coverage

Join our Discord community to discuss ideas and get involved!

License

Mozilla Public License Version 2.0